Gregor Kalas is Associate Professor of Architectural History at the University of Tennessee, Knoxville, where he is the Riggsby Director of the Marco Institute for Medieval and Renaissance Studies. He is the author of The Restoration of the Roman Forum in Late Antiquity: Transforming Public Space (2015). Ann van Dijk is Associate Professor of Art History in the School of Art and Design at Northern Illinois University. Her publications examine the patronage of Pope John VII as well as its reception in the early modern period. Her articles have appeared in The Art Bulletin, Dumbarton Oaks Papers, Word & Image, and Renaissance Studies.